1st -- Congrats for going back!!!!
2nd -- If you like accounting, that's great! I know with me, I do computer work and some nights, when I get home, I really don't want to SEE a computer. If you worked with pets and had a rough day and are tired of dealing with slobber and don't want to throw that tennis ball one more time (though I don't know how you could tire from those things
) you can't just say 'sorry pets, I've had enough animals for one day' <again, don't see that happening, but I don't work in the field>.
You might be able to find a company that does stuff for animals. One of my friends works in IT for a pet insurance company (Friday's friendly pets are welcome in the office). Or you can always volunteer at a shelter or even just work with your own pets a little bit more.